Top API Development & Integration Firms

API development and integration firms build the interfaces that let software talk to other software, and wire up the ones that already exist. Work ranges from designing REST, GraphQL or gRPC APIs for a product or partner program to connecting payment gateways, CRMs, ERPs, shipping carriers, messaging platforms and banking or healthcare systems through their published APIs. Companies hire for it when staff retype data between two systems, when partners want programmatic access, or when a monolith is being split into services.

Compare firms here on the systems they have integrated before, the documentation they hand over, and how they handle authentication, versioning and outages when a third-party API fails.

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We evaluate companies on verified profile data: services, pricing, locations, and portfolio. Client reviews are being collected. We may earn a fee for some placements. How we rank and verify

8,490 Companies

List of the Best API Development & Integration Agencies

Aletheia Data
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**Company Overview of Aletheia Data:** Aletheia Data stands out as a premier provider of extensive data analytics, data engineering, and MLOps solutions. Our mission, fueled by a commitment to truth and innovation, is to equip organizations with the tools and expertise necessary to fully harness the
Highlights
$5,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
10-49
Employees
Services Provided+1 Services
33% API Development & Integration
20% Generative AI
10% AI Strategy & Roadmap Consulting
4% BI & Big Data Consulting & SI
AI Summary
“Aletheia Data delivers advanced data analytics, engineering, and MLOps solutions using multi-cloud data mesh architectures, enabling scalable, secure, and innovative data-driven business transformation.”
Lucky Developer
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I offered effective Magento web development services on a contractual basis, covering a wide range of Magento-related offerings such as integration, payment gateway setup, API development, and Magento Cloud Services. With over 10 years of experience on the Magento platform, I have created eCommerce
Highlights
Services Provided
70% E-Commerce Development
30% API Development & Integration
AI Summary
“Lucky Developer provides comprehensive Magento web development services including integration, payment gateway setup, API development, and cloud solutions, leveraging over 10 years of expertise in eCommerce platforms.”
BLACKSPEKTRO
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Blackspektro is a company focused on deep-tech innovation. Its primary objective is to create advanced products and provide high-quality services that enable businesses to succeed in a rapidly changing technological environment. We prioritize engineering and strive for excellence in our technical so
Highlights
$5,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
2-9
Employees
Services Provided+2 Services
15% Custom AI Chatbot Development
8% Cloud Consulting & SI
17% AI Strategy & Roadmap Consulting
10% Generative AI
AI Summary
“Blackspektro specializes in deep-tech innovation, delivering advanced engineering solutions and high-quality services to empower businesses in rapidly evolving technological landscapes.”
ecce.
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At ecce, we create custom software that streamlines complexities and fosters business growth. Our services extend beyond website creation; we design comprehensive digital ecosystems. Our specialization lies in crafting tailored applications and intelligent automation solutions that integrate well wi
Highlights
$75,000+
Min Project Size
$50-99/hr
Avg Hourly Rate
10-49
Employees
Otford, England, Gb
Services Provided+1 Services
30% Custom Web Application Development
10% Mobile App Development (iOS & Android)
25% API Development & Integration
30% E-Commerce Development
AI Summary
“ecce develops custom software and automation solutions that streamline operations, integrate with existing systems, and enhance business efficiency through tailored, scalable digital ecosystems.”
Anvil Development Agency Inc.
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Anvil is an innovative technology firm committed to providing smart, dependable, and scalable solutions for businesses of all sizes. Our goal is to empower organizations to address complex challenges with accuracy and assurance. By merging extensive industry knowledge with advanced technologies, we
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
2-9
Employees
Dover, Delaware, Us
Services Provided
45% Custom Web Application Development
15% Mobile App Development (iOS & Android)
30% API Development & Integration
10% Blockchain & Web3 Development
AI Summary
“Anvil Development Agency Inc. delivers innovative, customizable technology solutions that optimize operations, enhance efficiency, and drive measurable growth for businesses across industries with reliability and strategic insight.”
LUXECOG
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Luxecog is a dynamic full-stack digital services agency that assists businesses in transforming their ideas into scalable digital solutions. With over 15 years of industry expertise, we focus on developing responsive websites, custom software, mobile applications, and intuitive UI/UX designs, along
Highlights
< $25/hr
Avg Hourly Rate
2-9
Employees
Services Provided
50% Custom Web Application Development
30% API Development & Integration
10% DevOps Engineering
10% Backend Development
AI Summary
“Luxecog is a full-stack digital agency providing responsive web development, custom software, mobile apps, UI/UX design, and digital marketing to empower businesses across industries.”
MarqueFactory
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MarqueFactory is a software development firm that supports startups and businesses in creating scalable SaaS solutions, web applications, and tailored software. With over 19 years of experience, we focus on MVP development, system architecture, and establishing long-term technical collaborations. We
Highlights
$5,000+
Min Project Size
< $25/hr
Avg Hourly Rate
2-9
Employees
Karachi, Sindh, Pk
Services Provided
45% Custom Web Application Development
30% API Development & Integration
10% E-Commerce Development
15% Mobile App Development (iOS & Android)
AI Summary
“MarqueFactory is a seasoned software firm specializing in scalable SaaS and custom applications, partnering with startups to develop robust, performance-driven solutions across diverse industries.”
ID Studio Web Design
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ID Studio, based in London for 25 years, is a highly acclaimed web design agency that brings together the expertise of skilled in-house brand specialists, web designers, and developers to create impactful websites that enhance your brand and boost conversions.
Highlights
$10,000+
Min Project Size
$100-149/hr
Avg Hourly Rate
10-49
Employees
London, England, Gb
Services Provided+2 Services
25% API Development & Integration
25% Web App UI Design
13% Brand Identity Design
7% Brand Refresh & Rebranding
AI Summary
“ID Studio is a London-based web design agency with 25 years of experience, combining in-house branding, design, and development expertise to deliver impactful, conversion-focused websites.”
RS Techno Soft
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Harness the power of your ideas with our tailored software solutions, transforming concepts into significant digital realities with effortless integration.
Highlights
$1,000+
Min Project Size
$25-49/hr
Avg Hourly Rate
Noida, Uttar Pradesh, In
Services Provided
50% Custom Web Application Development
30% API Development & Integration
20% E-Commerce Development
AI Summary
“RS Techno Soft delivers tailored software solutions that transform ideas into impactful digital realities, ensuring seamless integration and addressing diverse client needs with expertise.”
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Bisgen Solutions Pvt Ltd
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We are an offshore IT delivery and platform engineering firm located in Bengaluru, guided by a team with over 22 years of practical experience in creating enterprise platforms from the ground up in sectors such as Healthcare IT, EdTech, OTT, SaaS, and Logistics. Our founder and head of delivery has
Highlights
< $25/hr
Avg Hourly Rate
10-49
Employees
Bengaluru, Karnataka, In
Services Provided+1 Services
15% E-Commerce Development
35% API Development & Integration
25% CRM Consulting and SI
20% ERP Consulting and SI
AI Summary
“Bisgen Solutions Pvt Ltd. is a Bengaluru-based offshore IT firm specializing in enterprise platform engineering across Healthcare, EdTech, SaaS, and Logistics, delivering end-to-end solutions with experienced leadership.”

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Top API Development & Integration Firms

List of the Best API Development & Integration Agencies

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